低氮燃烧改造在电厂应用研究

为满足国家环保对火电厂氮氧化物排放要求,以及在运机组采用"先降后脱"的脱硝指导思想,利用3号机组大修,完成了低氮燃烧器改造。通过主喷嘴局部改造,增加燃尽喷嘴;可以有效降低N0x排放,保证锅炉效率。

旋流对冲锅炉低氮燃烧特性数值模拟研究

根据某电厂实际的旋流燃烧煤粉锅炉进行分析简化,建立燃烧数值模拟简化的物理模型,选择合适的燃烧模型,研究烟煤在旋流锅炉内的燃烧特性以及NOX生成特性,寻求NOX的排放规律,为锅炉低氮燃烧调整提供科学依据,减少盲目性。

煤气锅炉低氮低硫燃烧性能优化

依据煤气锅炉实际情况,阐述影响锅炉排放烟气中SO2、NOx浓度的因素。在实践中采取调整锅炉高、焦炉煤气流量配比以及上、下层燃烧器间煤气空气比例等措施,满足国家对煤气锅炉排放烟气中SO2、NOx浓度的环保要求。

全负荷脱硝技术在超临界燃煤机组的应用

在低负荷阶段,广东珠海金湾发电有限公司(以下简称"金湾电厂")两台锅炉的脱硝系统因烟温低而退出运行,造成烟气污染物的超标排放。为了使低负荷时氮氧化物(NO_x)的排放达到最新环保要求,金湾电厂对锅炉进行了脱硝改造:首先在锅炉尾部烟道加装了脱硝装置并对省煤器进行分级改造,然后进行低氮燃烧调整以及启停机运行的优化。改造后,烟囱出口NO_x的质量浓度小于30mg/m^3(标准状态下),40%~60%负荷阶段脱硝装置投运率100%,有效地减少污染物的排放,较好地解决锅炉因烟温低而脱硝系统不能投入运行的问题。

Low-NOx Combustion Retrofit and Running Adjustment for 600-MW Utility Boiler with Four-Corner Tangential Firing

Low-NOX combustion retrofit is performed by adopting staged combustion technology for a 600 MW utility boiler with a four-corner tangential firing system. The emission data of NOX before and after retrofit are compared and analyzed. The test results show that the emission concentration of NOX decreases obviously after the low-NOX retrofit. Additionally, the emission of NOX decreases by nearly 50% when the unit load is higher than 350 MW. It can also be concluded that the emission of NOX is influenced significantly by the amount of SOFA, the damper opening of auxiliary air, the differential pressure between the secondary air windbox and the furnace, and so on.